There seems to be some confusion with inter_rdpcm_flag and inter_rdpcm_dir_flag

1. inter_rdpcm_flag is only read if transform_skip_flag==1, but 7.3.8.11 uses it when calculating signHidden without checking transform_skip_flag
2. inter_rdpcm_flag and inter_rdpcm_dir_flag are written as a 2d array, but used as a 3d array
3. In 8.5.4.2, the subprocess 8.6.5 is called without checking inter_rdpcm_flag is 1
4. In 8.5.4.3, the subprocess 8.6.5 is called without checking inter_rdpcm_flag is 1

I believe the following changes should be made:

1. In 7.3.8.11

residual_dpcm_inter_enabled_flag && inter_rdpcm_flag[ x0 ][ y0 ][ cIdx ]
should change to
residual_dpcm_inter_enabled_flag && transform_skip_flag[ x0 ][ y0 ][ cIdx ] && inter_rdpcm_flag[ x0 ][ y0 ][ cIdx ]

2. In 7.3.8.11

inter_rdpcm_flag[ x0 ][ y0 ]
if( inter_rdpcm_flag[ x0 ][ y0 ] )
inter_rpdcm_dir_flag[ x0 ][ y0 ]
should change to

inter_rdpcm_flag[ x0 ][ y0 ][ cIdx ]
if( inter_rdpcm_flag[ x0 ][ y0 ][ cIdx ] )
inter_rdpcm_dir_flag[ x0 ][ y0 ][ cIdx ]

3. In 8.5.4.2

When residual_dpcm_inter_enabled_flag is equal to 1 and transform_skip_flag[ xCb + xB0 ][ yCb + yB0 ][ 0 ] is equal to 1

should change to

When residual_dpcm_inter_enabled_flag is equal to 1 and transform_skip_flag[ xCb + xB0 ][ yCb + yB0 ][ 0 ] and inter_rdpcm_flag is equal to 1

4. In 8.5.4.3

When residual_dpcm_inter_enabled_flag is equal to 1 and transform_skip_flag[ xCb + xBN ][ yCb + yBN ][ cIdx ] is equal to 1

should change to

When residual_dpcm_inter_enabled_flag is equal to 1 and transform_skip_flag[ xCb + xB0 ][ yCb + yBN ][ cIdx ] is equal to 1 and inter_rdpcm_flag[ xCb + xB0 ][ yCb + yBN ][ cIdx ]

(Also note that in the last item, both mentions of xBN should change to xB0)